The Bug:
The first time the "Players" list is opened in the Realms menu, the game can stutter or completely stop momentarily as the player scrolls with enough players invited.

Steps to Reproduce:

1. Own a Realm.
2. Open the Realms panel by clicking the "Minecraft Realms" button from the title screen.
3. Click on your own Realm.
4. Click on the "Configure" button on the bottom of the screen.
5. Click on the "Players" button on the top of the screen.
6. Scroll down through the list (Note: this only seems to happen the first time you open this list within a single instance of Minecraft).
7. If there are enough players (this becomes especially noticeable with over 100 invited players), the game will stutter or completely freeze as you scroll.

Observed Behavior:
If enough players are invited (seen attached with 109 players, and in the video linked below with 403 players), the game will stutter or slow down massively as the player list is scrolled through.

Expected Behavior:
The list will be scrolled through without lag as it did in previous versions up until 1.19.4.

Video demonstrating more intense lag resulting from a player list of 409 members MC-261030 by ChainsawNinja.mp4